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arXiv · 1104.0552

FMR and voltage induced transport in normal metal-ferromagnet-superconductor trilayers

Hans Joakim Skadsem·Arne Brataas·Jan Martinek·Yaroslav Tserkovnyak
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Abstract

We study the subgap spin and charge transport in normal metal-ferromagnet-superconductor trilayers induced by bias voltage and/or magnetization precession. Transport properties are discussed in terms of time-dependent scattering theory. We assume the superconducting gap is small on the energy scales set by the Fermi energy and the ferromagnetic exchange splitting, and compute the non-equilibrium charge and spin current response to first order in precession frequency, in the presence of a finite applied voltage. We find that the voltage-induced instantaneous charge current and longitudinal spin current are unaffected by the precessing magnetization, while the pumped transverse spin current is determined by spin-dependent conductances and details of the electron-hole scattering matrix. A simplified expression for the transverse spin current is derived for structures where the ferromagnet is longer than the transverse spin coherence length.

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Hans Joakim Skadsem, Arne Brataas, Jan Martinek, Yaroslav Tserkovnyak. 2011-04-04. FMR and voltage induced transport in normal metal-ferromagnet-superconductor trilayers. https://doi.org/10.1103/physrevb.84.104420

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